Telephone set base



FIG. 1 is a front, top and right side perspective view of a telephone set base showing my new design;

FIG. 2 is a top plan view;

FIGS. 3 and 4 are respectively front and rear elevational views;

FIG. 5 is a right side elevational view; and

FIG. 6 is a bottom plan view. 

The ornamental design for a telephone set base, substantially as shown and described. 